protected function registerLogger(Application $app)
{
$logger = new Logger($app->environment());
$logPath = $app->storagePath() . '/logs/flarum.log';
$handler = new StreamHandler($logPath, Logger::DEBUG);
$handler->setFormatter(new LineFormatter(null, null, true, true));
$logger->pushHandler($handler);
$app->instance('log', $logger);
$app->alias('log', 'Psr\\Log\\LoggerInterface');
}